Improvement of G. 729 Algorithm Based on Voice Active Detection
Zheng Hong, Guo Ling Dong, K.T. Kwok, Chen Xi Cai · Journal of Xiamen University · 2002
ITU T G.729 is a useful full rate recommendation for 8 kb/s digital speech communication. However it seems rather complex when applied to personal communication systems. Noticing that active speech is only account about 40% of real two way conversation, a simplified version of G.729 based on voice active detection (VAD) is presented in this paper. After applying voice active detection, G.729 will enable not only bit rate saving but also computation improving. The average bit rate of G.729 will be down to lower than 4 kb/s and computation time will be saved up to 54% in this improved G.729. Performance of the algorithm under different noise is also presented. Tests show good result under different noisy environments.